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INTRODUCTION

The following conversions should be committed to memory. Please note on the CPJE exam, calculators are NOT allowed. You should expect simple calculations.

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VOLUME CONVERSIONS
1 teaspoon (tsp) 5 mL
1 tablespoon (tbsp.) 15 mL
1 fluid ounce (fl. oz.) 29.57 mL or ~30 mL
1 cup

8 oz.

236.56 mL or

~240 mL

1 pint

16 oz.

473 mL or

~480 mL

1 quart

2 pints

946 mL or

~960 mL

1 gallon

4 quarts

3,785 mL or

~3.840 mL

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HEIGHT CONVERSIONS
1 inch (in) 2.54 cm
1 meter (m) 100 cm

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WEIGHT CONVERSIONS
1 oz. 28.4 g
1 pound (lb.) 454 g
1 kg 2.2 lbs.
1 grain

64.8 mg or

~65 mg

PRACTICE CALCULATION QUESTIONS

  1. A pharmacist is checking an order for enoxaparin 1 mg/kg subcutaneous (SC) every 12 hours for 5 days, prior to dispensing it. The patient weighs 148 lbs. Based on the order information, what is the total daily dose that this patient should receive?

    Convert the patient's weight in lb. to kg:

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    Total daily dose for this patient:

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  2. What is the final concentration of 37.5 grams of a 12.2% w/w ointment are mixed with 62.5 grams of a 17.6% w/w ointment?

    Determine the weight of the active ingredient in each product:

    12.2% w/w:

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    17.6% w/w:

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    Add the weights together to determine the final weight:

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    Divide the weight of the active ingredient by the final weight of the ointment to determine the final concentration:

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  3. A pharmacist is asked to prepare 100 grams of a 65% hydrocortisone powder using the 25% and 80% powders that he has in stock. How much of each is required to prepare this order? This is an alligation problem that requires to obtain a new strength using the two strengths the pharmacist has in stock. Set up the problem as seen below:

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Determine number of parts of the 80%:

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Determine the number of parts of the 25%:

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Determine the number of parts of the 65%:

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Calculate the weight per part using the weight needed to prepare to divide the 55 parts:

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Calculate the weight (amount) of each hydrocortisone powder (65% and 85%) has in stock required to make the desired 65% hydrocortisone powder:

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When mixing these two together, the end product gives a 100 g of a 65% hydrocortisone powder.

IV:PO DOSE RATIO

This table shows the conversion of IV dose to PO dose of some common medications.

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